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Archived

Avalanche Forecast

Feb 10th, 2018–Feb 11th, 2018
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

http://www.pc.gc.ca/apps/scond/cond_e.asp?oid=30728&opark=100092Although the storm is over large avalanches are still likely.  The heat of the sun today could make the storm slab more reactive.

Weather Forecast

In the wake of last week's storm a ridge of arctic high pressure will sitting over much of inland BC.  This cold air mass will give us clear sunny skies and cold temps.  Freezing level will stay at valley bottom with a high in the Alpine of -15 deg C and a 15kph Westerly wind.  Bundle up today!

Snowpack Summary

Approximately 60cm of new snow in the past 3 days has settled into a widespread storm slab. Strong winds in the alpine have created variable wind slab in the alpine and in exposed areas at treeline. Dec and Jan persistent weak layers are now buried 150-200cm in the snowpack. Height of snow is 350cm at Treeline.

Avalanche Summary

Numerous natural and artillery controlled avalanches to sz 4.0 occurred during Thursdays storm. Several ran full extent, taking out mature trees. Yesterday avalanche control just west of the park produced more large destructive size 4 avalanches piling debris 10-15m deep. While natural activity may taper today, human triggered avalanches are likely

Confidence

Due to the number and quality of field observations

Avalanche Problems

Storm Slabs

The last storm brought over 60cm of snow in 48hrs. In the alpine, mod winds have built windslab. If triggered these slabs will propagate very wide. Cornices have also grown in size & become more fragile in the last week, give them a wide berth!
Be aware of the potential for wide propagations.If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1.5 - 3

Persistent Slabs

Several deeply buried persistent weak layers have become reactive with the new snow load. If these layers are triggered the resulting avalanches will have the potential to reach the full extent of their run-out zones, possibly even further.
If triggered the storm slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 2.5 - 4